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Taxi drivers in New York were worried about adding credit cards to their cabs. The fee (5% or so) would cost them too much, they said.

It turns out that tips are up, way up. They're actually making far more money now.

Why? Because most of the machines offer a shortcut for the tip: $2, $3 or $4.

You can decide to be a cheapskate and hit the $2 button. Except…

Except that if you had paid cash, you probably would have tipped 75 cents for that $4.25 ride. It takes a few more clicks to type in 75 cents, and hey, $2 is the lowest and it's a more 'normal' amount.

It's a three second decision that happens over and over. People really like cues.